4 requirements for knitting yarn quality:

1. The yarn should have partial strength and extensibility

The strength of knitting yarn is an important quality index of knitting yarn. Since the yarn is subjected to partial tension and repeated loads during preparation and weaving, the knitting yarn must have partial strength. In addition, the yarn will also be bent and twisted during the knitting process. Therefore, the knitting yarn is required to have partial extensibility so that it can be bent into loops during the knitting process to reduce yarn breakage.

2. Yarn must have good softness

The softness of knitting yarn is higher than that of woven yarn. Because the soft yarn is easy to bend and twist, the loop structure in the knitted fabric is uniform, and the appearance is clear and beautiful, which can reduce the yarn breakage and the damage of the loop forming machine during the weaving process.

3. The yarn must have partial twist

Generally speaking, the twist of knitting yarn is lower than that of woven yarn. If the twist is too large, the yarn softness is poor, and it is not easy to bend or twist during weaving, and it is easy to produce kinks, which can cause weaving defects and damage the knitting needles. In addition, the yarn with too large twist will affect the elasticity of the knitted fabric and make the loops skewed. .

However, the twist of the knitting yarn should not be too low, otherwise it will affect its strength, increase the breakage during weaving, and the yarn is bulky, making the fabric easy to fuzz and pilling, and reduce the wear resistance of the knitted fabric. Therefore, the correct choice of twist is An important way to select yarns reasonably. Different uses of knitted fabrics require different twists.

(1) Single jersey knitted fabrics are required to be flat, dense, smooth in surface and clear in texture. The twist of the yarn should be larger, which can be close to the standard for weaving warp yarns with the same linear density.

(2) The twist of the outer clothing yarn should be larger to enhance the stiffness and reduce pilling.

(3) Cotton wool cloth and stretch cloth are required to be soft and elastic, and the yarn twist should be slightly lower. Generally, weft yarns woven with the same linear density have a lower twist. The yarn used for raised knitted fabric is to facilitate raising, and make the pile thickness uniform, and the twist requirement is small.

4. The yarn density should be uniform and the yarn defect should be less

The uniformity of yarn linear density, that is, the uniformity of yarn evenness, is an important quality indicator of knitting yarn. Uniform yarn is beneficial to knitting and ensuring the quality of the fabric, so that the loop structure is uniform and the cloth surface is clear.